Female Infrahyoid Region, Gross Anatomy

Description

Framed between the body of the hyoid bone superiorly and the suprasternal (jugular) notch and clavicles inferiorly, the female infrahyoid region is centered on the anterior midline of the neck. Superficial layers include skin, platysma, and the investing layer of deep cervical fascia, with the sternocleidomastoid muscles forming the lateral contours as they descend from the mastoid process to the manubrium and medial clavicle. Deep to the fascia, the paired infrahyoid (strap) muscles occupy the muscular triangle: sternohyoid and omohyoid lie more superficial and medial, while sternothyroid and thyrohyoid sit deeper, spanning between the sternum, thyroid cartilage, and hyoid. Midline landmarks include the thyroid cartilage, cricoid cartilage, upper tracheal rings, and the thyroid gland hugging the anterolateral trachea. An anterior understanding of this compartment matters because it is where airway access and endocrine surgery intersect with dense fascial planes and small but unforgiving vascular targets. The cricothyroid membrane sits immediately inferior to the thyroid cartilage and just superior to the cricoid, a narrow window for emergency cricothyrotomy that becomes harder to palpate in patients with short necks or prominent subcutaneous tissue. Lower in the infrahyoid field, tracheostomy traverses the pretracheal fascia between the strap muscles, with the thyroid isthmus commonly crossing the second to fourth tracheal rings and the anterior jugular venous arch variable in the superficial midline. Small mistakes here bleed. Use this illustration to teach surface anatomy and cervical triangles in gross anatomy, to anchor surgical atlases covering thyroidectomy, tracheostomy, and anterior neck dissection, or to support patient-facing education on neck incisions and postoperative landmarks. Anatomical accuracy verified by SciePro's Medical Advisory Board.